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You don't need two PC's to stream to be a successful streamer, but it does have 2 big advantages:
For gaming, Alisa uses a Intel Core i9-9900K CPU with a Gigabyte AORUS GeForce RTX 3080 MASTER 10G GPU. She uses a ASUS ROG Strix Z390-E motherboard. Alisa uses G.SKILL Ripjaws V Series 16GB memory and a Samsung 960 EVO 250GB SSD for storage.
For streaming, Alisa uses a AMD Ryzen 7 3700X CPU with a MSI Gaming GeForce GTX 1660 Ti GPU. She uses a MSI X570-A PRO motherboard. Alisa uses CORSAIR Vengeance LPX 16GB memory and a Crucial MX500 250GB SSD for storage.